Note: Descriptions are shown in the official language in which they were submitted.
Polyalkene alcohol polyetheramines and their use in fuels and
lubricants
The present invention relates to special polyalkene alcohol
polyetheramines, their use as carrier oils, detergents or
dispersants in fuel and lubricant compositions and fuel and
lubricant additive concentrates and fuel and lubricant
compositions themselves which contain these polyalkene alcohol
polyetheramines.
Carburetors and intake systems of gasoline engines as well as
injection systems for fuel metering are increasingly contaminated
by impurities which are caused by dust particles from the air,
uncombusted hydrocarbon residues from the combustion chamber and
the crank case vent gases passed into the carburetor.
These residues shift the air/fuel ratio during idling and in the
lower part-load range so that the mixture becomes leaner and the
combustion more incomplete and in turn the proportions of
uncombusted or partially combusted hydrocarbons in the exhaust
gas become greater and the gasoline consumption increases.
It is known that, to avoid these disadvantages, fuel additives
are used for keeping valves and carburetors or injection systems
of gasoline engines clean (cf. for example: M. Rossenbeck in
Katalysatoren, Tenside, Mineraloladditive, Editors J. Falbe and
U. Hasserodt, page 223, G. Thieme Verlag, Stuttgart 1978).
Frequently used fuel additives of this type are
polyisobuteneamines, as described, for example, in EP-A 244 616,
or polyetheramines, as described, for example, in EP-A 310 875.
The class consisting of the polyisobuteneamines generally has a
good effect but - depending on the chain length of a
poly(iso)butene moiety in the molecule, the engine type and the
additive concentration used - they often cause sticking of the
valves, which may lead to total failure of the engine. The
sticking of the valve is understood here as meaning complete loss
of compression in one or more cylinders of the internal
combustion engine if - owing to polymer deposits on the valve
shaft - spring forces are no longer sufficient to close the
valves properly.
Although polyetheramines generally also exhibit good activity,
their usability is subject to certain restrictions. Owing to the
polar polyether chain, the solubility in the nonpolar fuel may be
CA 02369752 2001-10-04
2
reduced. For compensation, it is then necessary either to~use.
long-chain alkanols as initiator molecules for the preparation of
the polyetheramines, which are industrially available only to a
limited extent, or it is necessary to use long-chain epoxides
such as butylene oxides, pentene oxides or cyclohexene oxide, to
synthesize the polyether chain, which entails substantially
higher costs.
It is an object of the present invention to provide mineral oil
additives, in particular detergents, for lubricant compositions
and in particular fuel compositions, which no longer have the
prior art problems described.
we have found that this object is achieved by polyetheralkene
alcohol polyetheramines of the formula I
R1-(CHz)n-(~-A)m-NR2R3 (I)
where
R1 is a polyalkene radical derived from C2- to C3o-alkenes and
having a number average molecular weight of from 300 to 5000,
RZ and R3 may be identical or different and are hydrogen,
aliphatic or aromatic hydrocarbon radicals, primary or
secondary, aromatic or aliphatic aminoalkylene radicals or
polyaminoalkylene radicals, polyoxyalkylene radicals,
heteroaryl or heterocyclyl radicals or, together with the
nitrogen atom to which they are bonded, form a ring in which
further heteroatoms may be present, the maximum number of
carbon atoms in R2 and R3 together being 400,
A is an alkylene group of 2 to 8 carbon atoms,
m is from 1 to 200 and
n is 0 or 1.
Suitable radicals R1 are straight-chain or branched hydrocarbon
groups which are derived from C2- to C3o-alkenes, in particular
from C3- to C12-alkenes, especially from C3- to C6-alkenes.
Typical alkenes are ethene, propene, butenes, pentenes, hexenes,
heptenes, octenes, nonenes, decenes, undecenes and dodecenes. Of
particular interest are propene, n-butene and isobutene. The
polyalkene on which the hydrocarbon radical R1 is based is
obtainable by oligomerization or polymerization of these alkenes,
the oligomerization or polymerization being carried out as a rule
CA 02369752 2001-10-04
3
(for example by cationic or coordination oligomerization or
polymerization) so that the chain termination leads to a double
bond which can be further functionalized to give the
corresponding polyalkene alcohol.
R1 is preferably a polybutyl or polyisobutyl radical derived from
isobutene and up to 20% by weight of n-butene and having a number
average molecular weight (MN) of from 300 to 2500. R1 is
particularly preferably a polybutyl or polyisobutyl radical
having a number average molecular weight of from 350 to 1500, in
particular from 400 to 850, especially from 450 to 700.
Preferably, R1 is also composed of isobutene units alone.
R1 may preferably be based on highly reactive polyisobutene
(having double bonds permanently in the a-position) which - as
described in EP-A 277 345 - can be converted into the
corresponding alcohol R1-CH2-OH (n = 1) by hydroformylation. Where
n = 0, polybutenes or polyisobutenes having double bonds which
are predominantly further toward the interior of the polymer
chain (for example in the ~- and y-position) are usually used as
starting materials in the preparation of corresponding polybutene
alcohols or polyisobutene alcohols; these are then usually
converted into the poly(iso)butene alcohols either by ozonolysis
and subsequent reduction or by epoxidation and subsequent
reduction or by hydroboration and subsequent hydrolysis or by
halogenation with chlorine or bromine and subsequent alkaline
hydrolysis.
The maximum number of carbon atoms in R2 and R3 together is
preferably 200, in particular 100, especially 30. When nitrogen
atoms are present in RZ and R3, their maximum number together is
preferably 20, in particular 10, especially 5. When oxygen atoms
are present in R2 and R3, their maximum number together is 60, in
particular 20, especially 10.
In a preferred embodiment, R2 and R3 are identical or different
and are each hydrogen, alkyl, aryl, hydroxyalkyl, an
aminoalkylene radical of the formula III
-R4-NRSR6 (III)
where R4 is an alkylene radical and R5 and R6, which are identical
or different, are each hydrogen, alkyl, aryl, hydroxyalkyl or a
polybutene or polyisobutene radical, a polyaminoalkyl radical of
the formula IV
CA 02369752 2001-10-04
4
I_R4_NR51PR6 (IV)
where the radicals R4 and the radicals RS are each identical or
different, R4, R5 and R6 have the abovementioned meanings and p is
from 2 to 8, or a polyoxyalkylene radical of the formula V
f-R4-olq-X (~)
where the radicals R4 are identical or different and have the
above meanings, X is alkyl or H and q is from 1 to 30, or R2 and
R3, together with the nitrogen atom to which they are bonded, form
a morpholinyl, pyridyl, piperidyl, pyrrolyl, pyrimidinyl,
pyrrolinyl, pyrrolidinyl, pyrazinyl or pyridazinyl radical.
In a particularly preferred embodiment, RZ and R3 are identical or
different and are each hydrogen, C1-Clo-alkyl, phenyl, naphthyl,
C1-Clo-hydroxyalkyl, an aminoalkylene radical of the formula III
-R4-NRSR6 (III)
where R4 is a C2-Clo-alkylene radical and RS and R6, which are
identical or different, are each hydrogen, C1-Clo-alkyl, phenyl,
naphthyl, C1-Clo-hydroxyalkyl or a polybutene or polyisobutene
radical, each of 20 to 398, especially 30 to 180, carbon atoms, a
polyaminoalkylene radical of the formula IV
~_R4_NR5~PR6 (IV)
where the radicals R4 and the radicals R5 are each identical or
different, R4, RS and R6 have the abovementioned meanings and p is
from 2 to 8, or a polyoxyalkylene radical of the formula VI
I_R4_O)q_H (VI)
where the radicals R4 are identical or different and have the
above meanings and q is from 1 to 30 or R2 and R3, together with
the nitrogen atom to which they are bonded, form a morpholinyl
radical.
In a~further particularly preferred embodiment, in the novel
polyalkene alcohol polyetheramines I, R2 is hydrogen and R3 is
likewise hydrogen or alkyl having a total of 2 to 8 carbon atoms
which also contains from 1 to 4 primary, secondary and/or
tertiary nitrogen atoms.
CA 02369752 2001-10-04
5
Suitable individual radicals RZ and R3 are, for example, methyl,
ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl,
tert-butyl, n-pentyl, isopentyl, sec-pentyl, tert-pentyl,
neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl,
isononyl, n-decyl, n-undecyl, isoundecyl, n-dodecyl, n-tridecyl,
isotridecyl, n-tetradecyl, n-hexadecyl, n-octadecyl, n-eicosyl,
cyclopentyl, cyclohexyl and phenyl. Typical nitrogen-containing
radicals RZ and R3 are the corresponding radicals of the
polyamines dimethylaminopropylamine, 1,2-ethylenediamine,
diethylenetriamine, triethylenetetramine and
tetraethylenepentamine, the parent polyalkene alcohol
polyalkoxylate of the formula R1-(CHZ)n-(0-A)m-OH being converted
into the polyalkene alcohol polyetheramine I via one of the
primary amine functions of these polyamines. Hydroxyl-containing
polyamines which are likewise bonded to the parent polyalkene
alcohol polyalkoxylate via a primary amine function, especially
compounds of the formula [-CHz-CH2-NH]r-CH2-CHy-OH, where r is
from 1 to 7, in particular 1, 2 or 3, are also suitable here.
Typical oxygen-containing radicals RZ and R3 are compounds of the
formula (-CH2-CHZ-0]g-CH2-OH, where s is from 0 to 30, in
particular from 1 to 15.
The degree of alkoxylation m depends on the molar mass of the
polyalkene alcohol and is preferably from 5 to 100, in particular
from 10 to 45, especially from 20 to 35, alkylene oxide units.
The alkylene group A is preferably derived from corresponding
alkylene oxides, such as ethylene oxide, propylene oxide,
1,2-butylene oxide and cis- or trans-2,3-butylene oxide. However,
it may also be 1,3-propylene, 1,4-butylene, 1,6-hexylene or
1,8-octylene. A may likewise be a mixture of different members of
said groups. A is particularly preferably 1,2-propylene,
1,2-butylene or a mixture thereof.
In a preferred embodiment, the novel polyalkene alcohol
polyetheramines I are derived from polyalkene alcohol
polyalkoxylates of the formula II
R1-(CH2)n-(0-A)m-OH (II)
where R1, A, m and n have the abovementioned meanings, with the
proviso that the oxygen in the oxyalkylate radical A-(0-A)m_1-OH
accounts for at least 16.5, in particular 17.5, especially 18.5,
% by weight of the number average molecular weight of the total
molecule of the compounds II.
CA 02369752 2001-10-04
CA 02369752 2001-10-04
6 _
In a further preferred embodiment, the molar mass of the .
oxyalkylate radical -A-(O-A)m_1-OH in the polyalkene alcohol
polyalkoxylate II is greater than the molar mass of the parent
polyalkene alcohol R-(CH2)n-OH. The molar mass of the oxyalkylate
radical -A-(0-A)m_1-OH in the polyalkene alcohol polyalkoxylate II
is in particular from 1.5 to 5, especially from 2 to 4, times the
molar mass of the parent polyalkene alcohol R-(CH2)n-OH. The molar
mass calculations are based on the number average molecular
weight.
The novel polyalkene alcohol polyetheramines I and the parent
polyalkene alcohol polyalkoxylates II can be prepared by
conventional methods. The polyalkene alcohol polyalkoxylates II
are obtained, for example, by reacting the parent polyalkene
alcohols R1-(CH2)n-OH with the corresponding amount of alkylene
oxide in the presence of suitable catalysts, such as potassium
hydroxide, preferably in an amount of from 0.01 to 1, in
particular from 0.05 to 0.5, % by weight, based on the amount of
the expected reaction product, in the case of potassium
hydroxide. Typical reaction temperatures are from 70 to 200~C, in
particular from 100 to 160~C. The pressure is usually from 3 to
bar. The reaction product can be worked up in a conventional
manner by expelling volatile components in gaseous form under
reduced pressure and, if required, by filtration.
The polyalkene alcohol polyetheramines I are prepared as a rule
from the compounds II by a reductive amination with ammonia,
monoamines or polyamines by conventional continuous or batchwise
processes using hydrogenation and amination catalysts usual for
this purpose, for example those which contain catalytically
active components based on the elements Ni, Co, Cu, Fe, Pd, Pt,
Ru, Rh, Re, A1, Si, Ti, Zr, Nb, Mg, Zn, Ag, Au, Os, Ir, Cr, Mo, W
or combinations of these elements with one another, in
conventional amounts. Typical reaction conditions are
temperatures of from about 80~C to 300~C and pressures of up to
about 600 bar.
The novel polyalkene alcohol polyetheramines I are very useful as
carrier oils, dispersants and in particular as detergents in
lubricant compositions and in particular fuel compositions,
especially gasoline fuel compositions.
Here, the compounds I can also advantageously be used together
with other conventional detergents. Examples of such conventional
detergents are:
CA 02369752 2001-10-04
7
a) Polyisobuteneamines which are obtainable according to EP-A
244 616 by hydroformylation of highly reactive polyisobutene
and subsequent reductive amination with ammonia, monoamines
or polyamines, such as dimethyleneaminopropylamine,
ethylenediamine, diethylenetriamine, triethylenetetramine or
tetraethylenepentamine,
b) Poly(iso)buteneamines which are obtainable by chlorination of
polybutenes or polyisobutenes having double bonds
predominantly in the ~- and Y-position and subsequent
amination with ammonia, monoamines or the abovementioned
polyamines,
c) Poly(iso)buteneamines which are obtainable by oxidation of
double bonds in poly(iso)butenes with air or ozone to give
carbonyl or carboxyl compounds and subsequent amination under
reducing (hydrogenating) conditions,
d) Polyisobuteneamines which are obtainable according to DE-A
196 20 262 from polyisobutene epoxides by reaction with
amines and subsequent dehydration and reduction of the
aminoalcohols,
e) Polyisobuteneamines which may contain hydroxyl group and are
obtainable according to WO-A 97/03946 by reaction of
polyisobutenes having an average degree of polymerization P
of from 5 to 100 with oxides of nitrogen or mixtures of
oxides of nitrogen and oxygen and subsequent hydrogenation of
these reaction products,
f) Hydroxyl-containing polyisobuteneamines which are obtainable
according to EP-A 476 485 by reaction of polyisobutene
epoxides with ammonia, monoamines or the abovementioned
polyamines,
g) Polyetheramines which are obtainable by reaction of C2- to
C3o-alkanols, C6- to C3o-alkanediols, mono- or di-C2- to
C3a-alkylamines, C1- to C3o-alkylcyclohexanols or C1- to
C3o-alkylphenols with from 1 to 30 mol of ethylene oxide
and/or propylene oxide and/or butylene oxide per hydroxyl or
amino group and subsequent reductive amination with ammonia,
monoamines or the abovementioned polyamines, polyetheramines
having a carbamate structure may also be used,
h) "Polyisobutene Mannich bases" which are obtainable according
to EP-A 831 141 by reaction of polyisobutene-substituted
phenols with aldehydes and monoamines or the abovementioned
polyamines.
Here, the compounds I can advantageously also be used together
with further conventional dispersants, such as imides, amides,
esters and ammonium and alkali metal salts of polyisobutene
succinic anhydrides, which are used in particular in lubricating
oils, but also as detergents in fuel compositions.
Gasoline fuel additives having an action which inhibits valve
seat wear may be used as further gasoline fuel additives,
together with the compounds I; for example, additives containing
carboxyl groups or their alkali metal or alkaline earth metal
salts, such as copolymers of CZ-C4o-olefins with malefic anhydride,
having a total molar mass of from 500 to 20 000, some or all of
whose carboxyl groups have been reacted to give the alkali metal
or alkaline earth metal salts and the remainder of the carboxyl
groups have been reacted with alcohols or amines, as described in
EP-A 307 815, or additives containing sulfo groups or their
alkali metal or alkaline earth metal salts, for example alkali
metal or alkaline earth metal salts of alkyl sulfosuccinates, as
described in EP-A 639 632, are of interest here. Such gasoline
fuel additives which inhibit valve seat wear can advantageously
also be used in combination with conventional fuel detergents,
such as poly(iso)buteneamines or polyetheramines, as described in
WO-A 87/01126.
The present invention also relates to fuel and lubricant additive
concentrates which contain the novel polyalkene alcohol
polyetheramines I in amounts of from 0.1 to 80, in particular
from 0.5 to 60, % by weight, based on the total amount of the
concentrates. These concentrates usually also contain further
conventional components and assistants.
Further conventional components and assistants are corrosion
inhibitors, for example based on ammonium salts of organic
carboxylic acids, which ammonium salts tend to form films, or on
heterocyclic aromatics in the case of nonferrous corrosion
protection, antioxidants or stabilizers, for example based on
amines, such as p-phenylenediamine, dicyclohexylamine or
derivatives thereof, or on phenols, such as
2,4-di-tert-butylphenol or
3,5-di-tert-butyl-4-hydroxyphenylpropionic acid, demulsifiers,
antistatic agents, metallocenes, such as ferrocene or
methylcyclopentadienylmanganesetricarbonyl, lubricity additives,
CA 02369752 2001-10-04
9
such as specific fatty acids, alkenyl succinic esters,
bis(hydroxyalkyl)-fatty amines, hydroxyacetamides or castor oil
and markers. Sometimes amines are also added for reducing the pH
of the fuel.
In addition to the detergent and dispersant function, the
compounds I have as a rule a carrier oil function, in particular
in fuels. However, other conventional carrier oils are also
suitable as further conventional components and additives for the
novel fuel and lubricant additive concentrates. Examples of these
are mineral carrier oils (base oils), in particular those of
viscosity grade "Solvent Neutral (SN) 500 to 2000", synthetic
carrier oils based on olefin polymers having MN = 400 to 1800,
especially based on polybutene or polyisobutene (hydrogenated or
nonhydrogenated), and on polyalphaolefins or internal polyolefins
and synthetic carrier oils based on alkoxylated long-chain
alcohols or phenols.
The present invention furthermore relates to fuel and lubricant
compositions, in particular fuel compositions, especially
gasoline fuel compositions, which contain the novel polyalkene
alcohol polyetheramines I in effective amounts. Effective amounts
are to be understood as a rule as meaning from 10 to 5000, in
particular from 50 to 2000, ppm by weight in the case of fuel
compositions and from 0.1 to 10, in particular from 0.5 to 5,
% by weight in the case of lubricant compositions, based in each
case on the total amount of the composition. The fuel and
lubricant compositions usually contain the stated further
components and assistants usual for this purpose, in addition to
the novel compounds I as carrier oils, detergents or dispersants.
Combinations of gasoline fuel with a mixture of the polyalkene
alcohol polyetheramines I, conventional synthetic carrier oils
based on alkoxylated long-chain alcohols or phenols and/or
polyisobuteneamine detergents, in particular those of the
abovementioned groups a), b), c) or d), and corrosion inhibitors
and/or lubricity additives based on carboxylic acids or fatty
acids, which may be present as monomeric and/or dimeric species,
are furthermore particularly suitable for the novel fuel
compositions.
The novel polyalkene alcohol polyetheramines I have an excellent
effect as gasoline fuel detergents for cleaning valves and
keeping them clean. In addition, they do not have the
disadvantages, described above, of the polyisobuteneamine and
polyetheramine detergents disclosed in the prior art.
Furthermore, they are sufficiently compatible with the other
CA 02369752 2001-10-04
to
additives so that no separation effects occur in the fuel~and
lubricant additive concentrates. Moreover, their viscosity
behavior does not give rise to any formulation problems.
Examples
Preparation of an adduct of propylene oxide with polyisobutene
alcohol (MN = 550) and subsequent reductive amination
A polyisobutene alcohol prepared according to EP-A 277 345 from
highly reactive polyisobutene by hydroformylation and having a
number-average molecular weight MN of 550 was reacted with 25 mol
of propylene oxide (PO) under conventional reaction conditions
(potassium hydroxide catalysis, 135~C reaction temperature).
260 g of liquid ammonia were added to 300 g of the resulting
adduct in an autoclave and heating was carried out at a hydrogen
pressure of 200 bar in the presence of a catalyst containing
nickel oxide, copper oxide, zirconium oxide and molybdenum oxide
(prepared according to Example 1 - 10 of EP-A 696 572) at 210~C
for 10 hours.
Testing of performance characteristics
In a Mercedes Benz M 102 E engine, the cleanness of the intake
valves was tested with the prepared polyisobutene alcohol
polyetheramine according to CEC-method F-05-A-93. A commercial
European premium-grade fuel according to EN 228, which contained
the above polyisobutene alcohol polyetheramine as a detergent in
a dose of 400 mg/kg of gasoline fuel, was used for this purpose.
The table below shows the test results:
Intake
valve
deposits
[mg/Valve]
1 2 3 4 Mean value
without 448 517 614 632 553
additive
with additive 2 42 14 38 24
'
CA 02369752 2001-10-04
